Alright. Thank you :) ANd Landorous Evs are 252 SpA, 252 Spe and 4 HP? Is that okay?
That's what Incarnate Landorus runs, yes.
Anyway, to expand what Moxie said, and to add another viable set:
-Earth Power
-Psychic
-Focus Blast
-Sludge Wave/Knock Off/Stealth Rock
Nature: Timid/Naive
EVs: 4 Def/252 SAtk/252 Spe
Item: Life Orb
Ability: Sheer Force
or
-Rock Polish
-Earth Power
-Psychic
-Knock Off/Focus Blast
Nature: Rash/Modest
EVs: 48 Atk/252 SAtk/208 Spe
Item: Life Orb
Ability: Sheer Force
For Charizard X, since it's running Roost, the EV spread of 248 HP/152 Atk/108 Spe is your best bet. This gives Charizard X enough bulk to get more than 1 Dragon Dance up per match. If you intend to keep your current spread, drop Roost for Earthquake so you can hit Heatran (and to a lesser extent, Azumarill). It all boils down to more power or more bulk.
What does Ferrothorn's EV spread accomplish, really? I don't think Ferrothorn needs that much offensive investment, considering that Power Whip hits hard even without investment. 252 HP/88 Def/168 SDef gives Ferrothorn more balanced bulk. And Lefties > Rocky Helmet, as there may be times when you don't have time to get Leech Seed up.
Mismagius is terrible, tbh. It's outclassed by other Ghost Pokemon, mainly Gengar, simply because Gengar is stronger and faster:
-Substitute
-Shadow Ball
-Will-o-Wisp
-Disable/Sludge Bomb/Sludge Wave/Focus Blast/Taunt
Nature: Timid
EVs: 28 HP/148 SAtk/80 SDef/252 Spe
Item: Black Sludge
or
-Shadow Ball
-Sludge Bomb/Sludge Wave
-Focus Blast/Thunderbolt
-Destiny Bond
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb
or
-Substitute
-Pain Split
-Shadow Ball
-Sludge Bomb/Sludge Wave/Focus Blast
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb
To add, Gliscor sets for you to use:
-Earthquake
-Substitute/Knock Off
-Toxic
-Protect
Nature: Impish
EVs: 244 HP/100 Def/160 Spe
Item: Toxic Orb
Ability: Poison Heal
or
-Earthquake/Knock Off
-Toxic/Knock Off
-Taunt
-Roost
Nature: Careful
EVs: 244 HP/192 SDef/84 Spe
Item: Toxic Orb
Ability: Poison Heal